Only experience will teach you day trading, as well as trader habits. You must work out your own strategy, and know how much you want to make profit on a deal and how much you are ready to lose. If you sell or buy with every movement, you will lose your money. You can check my post about "   
Mistakes that incur financial losses and their solutions"

https://bitcointalk.org/index.php?topic=5045407.msg46602205#msg46602205